project.json does not validate in VS-Code because of AnyCpu (expected anycpu)

When I open a project.json inside visual studio code. It does not validate

`platform": "AnyCpu"`

It should be

`"platform": "anycpu"`

Also Resharper inside Visual Studio does not validate this.

Start with the project.json example in the issue and reproduce its validation in Visual Studio Code, then check the same value in ReSharper inside Visual Studio. Locate the validation or schema entry point for the platform property. Done means the lowercase anycpu value validates in both tools without an error.

Written by the indexing model from the issue text.